Anticorrosive coating composition, anticorrosive coating film, and method for preventing corrosion of substrate

Abstract

An anticorrosive coating composition is provided which is excellent in adhesion to a substrate and in anticorrosiveness, and which provides a coating film whose surfaces hardly have bubbles remaining thereon even when the coating composition is applied by using a brush or a roller. The anticorrosive coating composition includes an epoxy resin (a), a curing agent (b) and a poly-α-olefin (c) that includes a structural unit derived from an α-olefin having 6 or more carbon atoms.

The invention claimed is: 
     
       1. An anticorrosive coating composition comprising
 an epoxy resin (a), 
 a curing agent (b), 
 a poly-α-olefin (c) that comprises a structural unit derived from an α-olefin having 6 or more carbon atoms and not containing, in its molecule, any aromatic structures or any polar groups, and 
 a solvent, 
 wherein the amount of the poly-α-olefin (c) is from 0.01 to 5 parts by weight (nonvolatile content) with respect to 100 parts by weight of a nonvolatile content in the anticorrosive coating composition. 
 
     
     
       2. The anticorrosive coating composition according to  claim 1 , further comprising a silane coupling agent (d). 
     
     
       3. The anticorrosive coating composition according to  claim 1 , further comprising an amide wax (e) and a liquid acrylic polymer (f). 
     
     
       4. The anticorrosive coating composition according to  claim 3 , wherein the liquid acrylic polymer (f) comprises a structural unit derived from an acrylate having an alkyl group of 4 to 18 carbon atoms containing a branched structure. 
     
     
       5. The anticorrosive coating composition according to  claim 3 , wherein the liquid acrylic polymer (f) comprises a structural unit derived from isobutyl acrylate or 2-ethylhexyl acrylate. 
     
     
       6. The anticorrosive coating composition according to  claim 3 , wherein the composition comprises the liquid acrylic polymer (f) in an amount of from 0.01 to 5 parts by weight (nonvolatile content) with respect to 100 parts by weight of a nonvolatile content in the anticorrosive coating composition. 
     
     
       7. The anticorrosive coating composition according to  claim 3 , wherein the liquid acrylic polymer (f) has a glass transition temperature of 0° C. or less. 
     
     
       8. The anticorrosive coating composition according to  claim 1 , further comprising an extender pigment (g). 
     
     
       9. The anticorrosive coating composition according to  claim 8 , wherein the extender pigment (g) includes at least a flaky pigment (h). 
     
     
       10. A method for preventing corrosion of a substrate, comprising applying on a substrate the anticorrosive coating composition according to  claim 1 . 
     
     
       11. The anticorrosive coating composition according to  claim 1 , wherein the α-olefin has from 6 to 20 carbon atoms. 
     
     
       12. The anticorrosive coating composition according to  claim 1 , wherein the α-olefin is selected from 1-hexene, 1-octene, 1-decease, 1-dodecene 1-tetradecene, 1-hexadecene, 1-octadecene, and mixtures thereof. 
     
     
       13. The anticorrosive coating composition according to  claim 1 , wherein the poly-α-olefin (c) is selected from a homopolymer obtained from 1-decene and copolymers obtained from at least two monomers selected from 1-decene, 1-octene, and 1-dodecene. 
     
     
       14. The anticorrosive coating composition according to  claim 1 , wherein the solvent is selected from xylene, toluene, methyl isobutyl ketone, methyl ethyl ketone, butyl acetate, butanol, isopropyl alcohol, 1-methoxy-2-propanol, and mixtures thereof.